SpringMVC入门

一、SpringMVC简介

Spring Web MVC是一种基于Java的实现了MVC设计模式的、请求驱动类型的、轻量级Web框架

二、SpringMVC的HelloWord实现

pom.xml配置


<dependency>
     <groupId>org.springframeworkgroupId>
     <artifactId>spring-webmvcartifactId>
     <version>${spring.version}version>
dependency>
 
 <dependency>
            <groupId>jstlgroupId>
            <artifactId>jstlartifactId>
            <version>1.2version>
        dependency>
 
        <dependency>
            <groupId>taglibsgroupId>
            <artifactId>standardartifactId>
            <version>1.1.2version>
        dependency>

SpringMVC处理请求的流程

1 首先用户发送请求–>DispatherServlet
2 DispatcherServlet–>HandlerMapping
3 DispatcherServlet–>HandlerAdapter
4 HandlerAdapter–>处理器功能处理方法的调用
5 ModelAndView的逻辑视图名–>ViewRecolver
6 View–>渲染
7 返回控制权给DispatcherServlet，由DispatcherServlet返回呼应给用户，流程结束

SpringMVC核心开发步骤

1 DispatcherServlet在web.xml中的部署描述，从而拦截请求到springMVC
2 HandlerMapping的配置，从而将请求映射到处理器
3 HandlerAdapter的配置，从而支持多种类型的处理器
4 处理器(页面控制器)的配置，从而刊行功能处理
5 ViewResolver的配置，从而将逻辑视图名解析为具体的视图技术

在WEB-INF下添加springmvc-servlet.xml(spring-mvc.xml)


"1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
      http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
    
    
    <aop:aspectj-autoproxy/>
    <context:component-scan base-package="com.zwc.ssm"/>
 
    
    
    
    <mvc:annotation-driven>mvc:annotation-driven>
 
    
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        
        <property name="viewClass"
                  value="org.springframework.web.servlet.view.JstlView">property>
        <property name="prefix" value="/"/>
        <property name="suffix" value=".jsp"/>
    bean>
 
    
    
   <mvc:resources location="/static/" mapping="/static/**"/>
    
 
 
beans>

applicationContext.xml


"1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
   
   <import resource="applicationContext-mybatis.xml">import>
beans>

HelloController


package com.zwc.ssm.controller;
 
 
import org.springframework.stereotype.Controller;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
 
import javax.servlet.http.HttpServletRequest;
 
/**
 * @authorzwc
 * @site www.javazwc.com
 * @company xxx公司
 * @create  2022-08-16 23:08
 */
/*
Controller:被标记的类会交给   Spring进行管理
Service
Repository
Component
以上四个都代表当前类交给Springr容器进行管理
 */
 
@Controller
@Service
public class HelloController {
 
//    浏览器发送请求
    @RequestMapping("/helloReq")
    public String hello(){
        System.out.println("hello springmvc....");
        return "hello";
    }
 
    @RequestMapping("/hello2")
    public ModelAndView hello(HttpServletRequest req){
        ModelAndView mv = new ModelAndView();
        mv.setViewName("hello");
        mv.addObject("msg","success...");
        return mv;
    }
 
}

Hello.jsp


<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2022/8/16
  Time: 17:26
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Titletitle>
head>
<body>
SpringMVC 你好
${msg}
body>
html>

3、增删改查之常用注解及返回值

BookController


package com.zwc.ssm.controller;
 
import com.zwc.ssm.biz.BookBiz;
import com.zwc.ssm.model.Book;
import com.zwc.ssm.util.PageBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
 
import javax.servlet.http.HttpServletRequest;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
 
/**
 * @authorzwc
 * @site www.javazwc.com
 * @company xxx公司
 * @create  2022-08-17 0:21
 *
 * @RequestMapping加在类上面，称窄化路径，其实就相当于包的概念
 *
 **/
@Controller
@RequestMapping("/book")
public class BookController {
 
    @Autowired
    private BookBiz biz;
    @RequestMapping(value = "/list",method = RequestMethod.GET)
    public String hello(HttpServletRequest req){
        System.out.println("hello springmvc....");
        PageBean pageBean = new PageBean();
        pageBean.setRequest(req);
        Map map = new HashMap();
        String bname = req.getParameter("bname");
        map.put("bname",bname);
        List maps = this.biz.listPage(map, pageBean);
        req.setAttribute("list",maps);
        return "hello";
    }
 
    @RequestMapping("/add")
    public String add(Book book){
        this.biz.insertSelective(book);
        return "redirect:/book/list";
    }
 
    @RequestMapping("/edit")
    public String edit(Book book){
        this.biz.updateByPrimaryKeySelective(book);
        return "redirect:/book/list";
    }
 
    @RequestMapping("/del/{bid}")
    public String del(@PathVariable("bid") Integer bid){
        this.biz.deleteByPrimaryKey(bid);
        return "redirect:/book/list";
    }
 
}

index.jsp


<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2022/8/17
  Time: 11:22
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Titletitle>
head>
<body>
<a href="${pageContext.request.contextPath}/book/list?bname=圣墟">查询所有a>
<a href="${pageContext.request.contextPath}/book/add?bid=2&bname=aa&price=9.9">增加a>
<a href="${pageContext.request.contextPath}/book/edit?bid=2&bname=bb&price=9">修改a>
<a href="${pageContext.request.contextPath}/book/del/2">删除a>
 
<img src="${pageContext.request.contextPath}/static/images/2.jpg">
body>
html>

hello.jsp


<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2022/8/16
  Time: 23:26
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>Titletitle>
head>
<body>
Springmvc你好
<hr>
${list}
<c:forEach items="${list}" var="c">
    ${c.bid}:${c.bname}:${c.price}<br>
c:forEach>
body>
html>

运行结果：

查询所有：

数据库数据：

测试增加：

测试修改：

测试删除：

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原文地址：https://blog.csdn.net/qq_65345936/article/details/126352588